Does the BLtouch miss the corner of the bed?
Thinking back, I remembered that I had to reset the endstop offsets. I had to increase the X offset by 10, and the Y offset by 56 (Since your Y rails are 50mm shorter than mine, I would think that 6mm would be enough) Just resetting the bed size and Z height isn’t enough, you have to also set the endstop offsets.
My suggestion:
G28
G0 Z5 F3000
G0 X0 Y0
Now, look at where the print head is. You want it to be right above the front left corner of the print bed
If it isn’t, use the jog controls to move it there, and then see what the LCD says. Use those numbers to adjust the endstop position in Marlin’s configuration.h
Edit: It also occurs to me that you remoxed the fan shroud piece. Did you change the probe offset from the nozzle in anything other than Z for the Volcano heat block?